Randomness is the only option available for a materialist when it comes to decision. That is true since decision is uncaused cause and material process is deterministic. The experience of wanting is after decision is made (following Libet's experiment) therefore they are different unrelated phenomena. We however observe fantastic correlation between what we consciously want and what we get. Therefore materialism is wrong (because you cannot expect a random change always correlates with conscious want).

Cannot grasp your argument.One point is you cannot include an 'uncaused cause' in your premise without first proving it exists as real.

Berkeley had argued against materialism [philosophical] quite effectively.The only flaw [the second part] in his argument is he relied on God to ground the ultimate, i.e. the mind of God.

An argument for idealism, such as those of Hegel and Berkeley, is ipso facto an argument against materialism. Matter can be argued to be redundant, as in bundle theory, and mind-independent properties can in turn be reduced to subjective percepts. Berkeley presents an example of the latter by pointing out that it is impossible to gather direct evidence of matter, as there is no direct experience of matter; all that is experienced is perception, whether internal or external. As such, the existence of matter can only be assumed from the apparent (perceived) stability of perceptions; it finds absolutely no evidence in direct experience.https://en.wikipedia.org/wiki/Materiali ... objections

Kant provided a more effective argument against materialism without relying on a mind of God.

What is materialism?

Materialism is a form of philosophical monism which holds that matter is the fundamental substance in nature, and that all things, including mental aspects and consciousness, are results of material interactions.

Materialism is closely related to physicalism, the view that all that exists is ultimately physical. Philosophical physicalism has evolved from materialism with the discoveries of the physical sciences to incorporate more sophisticated notions of physicality than mere ordinary matter, such as: spacetime, physical energies and forces, dark matter, and so on. Thus the term "physicalism" is preferred over "materialism" by some, while others use the terms as if they are synonymous.